diff --git a/bash/alias/git.sh b/bash/alias/git.sh
index 7db6300..94ffd6c 100644
--- a/bash/alias/git.sh
+++ b/bash/alias/git.sh
@@ -212,20 +212,49 @@ alias glp='git log --all --graph \
 # log medium information
 alias glm='git log --all --decorate --graph --pretty=medium'
 
-# fast-forward to remote branch
-alias gmf='git merge --ff-only'
+# abort the current merge commit
+alias gma="\
+git \
+merge \
+--abort \
+"
 
 # do a merge commit
-alias gmc='git merge --no-ff -m'
+alias gmc="\
+git \
+merge \
+--no-ff \
+-m \
+"
 
-# abort the current merge commit
-alias gma='git merge --abort'
+# do a signed merge commit
+alias gmcs="\
+git \
+merge \
+--no-ff \
+--gpg-sign \
+-m \
+"
+
+# fast-forward to remote branch
+alias gmf="\
+git \
+merge \
+--ff-only \
+"
 
 # squash a branch and index its modifications
-alias gms='git merge --squash'
+alias gms="\
+git \
+merge \
+--squash \
+"
 
 # merge via external tool
-alias gmt='git mergetool'
+alias gmt="\
+git \
+mergetool \
+"
 
 # push to the remote repository
 alias gp="\