diff --git a/.README.md b/.README.md
index 6f4cdf0..2e4cd81 100644
--- a/.README.md
+++ b/.README.md
@@ -516,11 +516,12 @@ Command|Description
 `gs`|Git status.
 `gst`|Git stash.
 `gd`|Git diff.
-`gc [MESSAGE]`|Git commit.
+`gdc <HASH>`|Git diff for a specific commit.
+`gc <MESSAGE>`|Git commit.
 `gch`|Git checkout.
 `gchb`|Git checkout branch.
 `gb`|Git branch.
-`gbd [BRANCH]`|Delete specified Git branch.
+`gbd <BRANCH>`|Delete specified Git branch.
 `gbda`|Delete all local branches except the current one.
 `gf`|Git fetch --all.
 `gt`|Git tag.
@@ -529,7 +530,7 @@ Command|Description
 `gp`|Git patch (apply).
 `ga`|Git add with preview.
 `gr [COUNT]`|Git rebase. 2 last commits by default. 0 means from root.
-`gu [EMAIL]`|Configure git user as Dmitry Voronin with specified email (project).
+`gu <EMAIL>`|Configure git user as Dmitry Voronin with specified email (project).
 `gg <REPO>`|Get git repo from my own git.
 
 ## Ls.
diff --git a/.config/bash/module/git.sh b/.config/bash/module/git.sh
index 4f9c615..005a43d 100644
--- a/.config/bash/module/git.sh
+++ b/.config/bash/module/git.sh
@@ -74,6 +74,13 @@ gg()
   git clone https://git.voronind.com/voronind/"${1}"
 }
 
+# See diff for a specific commit.
+# Usage: gdc <COMMITHASH>
+gdc()
+{
+  git diff "${1}^!"
+}
+
 # Show current branch.
 _git_current_branch()
 {
@@ -89,6 +96,7 @@ __git_complete gl _git_log        &> /dev/null
 __git_complete gs _git_status     &> /dev/null
 __git_complete gst _git_stash     &> /dev/null
 __git_complete gd _git_diff       &> /dev/null
+__git_complete gdc _git_diff      &> /dev/null
 __git_complete gc _git_commit     &> /dev/null
 __git_complete gch _git_checkout  &> /dev/null
 __git_complete gchb _git_checkout &> /dev/null