diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 945d2543b0..133ec92bfa 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1733,32 +1733,44 @@ __git_color_moved_opts="no default plain blocks zebra dimmed-zebra"
 __git_color_moved_ws_opts="no ignore-space-at-eol ignore-space-change
 			ignore-all-space allow-indentation-change"
 
+__git_ws_error_highlight_opts="context old new all default"
+
+# Options for the diff machinery (diff, log, show, stash, range-diff, ...)
 __git_diff_common_options="--stat --numstat --shortstat --summary
 			--patch-with-stat --name-only --name-status --color
 			--no-color --color-words --no-renames --check
 			--color-moved --color-moved= --no-color-moved
 			--color-moved-ws= --no-color-moved-ws
 			--full-index --binary --abbrev --diff-filter=
+			--find-copies --find-object --find-renames
+			--no-relative --relative
 			--find-copies-harder --ignore-cr-at-eol
 			--text --ignore-space-at-eol --ignore-space-change
 			--ignore-all-space --ignore-blank-lines --exit-code
-			--quiet --ext-diff --no-ext-diff
+			--quiet --ext-diff --no-ext-diff --unified=
 			--no-prefix --src-prefix= --dst-prefix=
-			--inter-hunk-context=
+			--inter-hunk-context= --function-context
 			--patience --histogram --minimal
 			--raw --word-diff --word-diff-regex=
 			--dirstat --dirstat= --dirstat-by-file
 			--dirstat-by-file= --cumulative
-			--diff-algorithm=
+			--diff-algorithm= --default-prefix
 			--submodule --submodule= --ignore-submodules
 			--indent-heuristic --no-indent-heuristic
-			--textconv --no-textconv
-			--patch --no-patch
-			--anchored=
+			--textconv --no-textconv --break-rewrites
+			--patch --no-patch --cc --combined-all-paths
+			--anchored= --compact-summary --ignore-matching-lines=
+			--irreversible-delete --line-prefix --no-stat
+			--output= --output-indicator-context=
+			--output-indicator-new= --output-indicator-old=
+			--ws-error-highlight=
+			--pickaxe-all --pickaxe-regex
 "
 
-__git_diff_difftool_options="--cached --staged --pickaxe-all --pickaxe-regex
-			--base --ours --theirs --no-index --relative --merge-base
+# Options for diff/difftool
+__git_diff_difftool_options="--cached --staged
+			--base --ours --theirs --no-index --merge-base
+			--ita-invisible-in-index --ita-visible-in-index
 			$__git_diff_common_options"
 
 _git_diff ()
@@ -1782,6 +1794,10 @@ _git_diff ()
 		__gitcomp "$__git_color_moved_ws_opts" "" "${cur##--color-moved-ws=}"
 		return
 		;;
+	--ws-error-highlight=*)
+		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
+		return
+		;;
 	--*)
 		__gitcomp "$__git_diff_difftool_options"
 		return
@@ -2024,6 +2040,12 @@ __git_log_shortlog_options="
 	--author= --committer= --grep=
 	--all-match --invert-grep
 "
+# Options accepted by log and show
+__git_log_show_options="
+	--diff-merges --diff-merges= --no-diff-merges --remerge-diff
+"
+
+__git_diff_merges_opts="off none on first-parent 1 separate m combined c dense-combined cc remerge r"
 
 __git_log_pretty_formats="oneline short medium full fuller reference email raw format: tformat: mboxrd"
 __git_log_date_formats="relative iso8601 iso8601-strict rfc2822 short local default human raw unix auto: format:"
@@ -2072,15 +2094,24 @@ _git_log ()
 		__gitcomp "$__git_diff_submodule_formats" "" "${cur##--submodule=}"
 		return
 		;;
+	--ws-error-highlight=*)
+		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
+		return
+		;;
 	--no-walk=*)
 		__gitcomp "sorted unsorted" "" "${cur##--no-walk=}"
 		return
 		;;
+	--diff-merges=*)
+                __gitcomp "$__git_diff_merges_opts" "" "${cur##--diff-merges=}"
+                return
+                ;;
 	--*)
 		__gitcomp "
 			$__git_log_common_options
 			$__git_log_shortlog_options
 			$__git_log_gitk_options
+			$__git_log_show_options
 			--root --topo-order --date-order --reverse
 			--follow --full-diff
 			--abbrev-commit --no-abbrev-commit --abbrev=
@@ -2097,7 +2128,6 @@ _git_log ()
 			--expand-tabs --expand-tabs= --no-expand-tabs
 			$merge
 			$__git_diff_common_options
-			--pickaxe-all --pickaxe-regex
 			"
 		return
 		;;
@@ -2992,10 +3022,19 @@ _git_show ()
 		__gitcomp "$__git_color_moved_ws_opts" "" "${cur##--color-moved-ws=}"
 		return
 		;;
+	--ws-error-highlight=*)
+		__gitcomp "$__git_ws_error_highlight_opts" "" "${cur##--ws-error-highlight=}"
+		return
+		;;
+	--diff-merges=*)
+                __gitcomp "$__git_diff_merges_opts" "" "${cur##--diff-merges=}"
+                return
+                ;;
 	--*)
 		__gitcomp "--pretty= --format= --abbrev-commit --no-abbrev-commit
 			--oneline --show-signature
 			--expand-tabs --expand-tabs= --no-expand-tabs
+			$__git_log_show_options
 			$__git_diff_common_options
 			"
 		return
diff --git a/diff.c b/diff.c
index 6fb2946a64..788382eea0 100644
--- a/diff.c
+++ b/diff.c
@@ -5520,6 +5520,10 @@ static int diff_opt_rotate_to(const struct option *opt, const char *arg, int uns
 	return 0;
 }
 
+/*
+ * Consider adding new flags to __git_diff_common_options
+ * in contrib/completion/git-completion.bash
+ */
 struct option *add_diff_options(const struct option *opts,
 				struct diff_options *options)
 {