diff --git a/doc/fugitive.txt b/doc/fugitive.txt
index 80fe916..8b08929 100644
--- a/doc/fugitive.txt
+++ b/doc/fugitive.txt
@@ -40,6 +40,8 @@ that are part of Git repositories).
                         -     |:Git| add
                         -     |:Git| reset (staged files)
                         C     |:Gcommit|
+                        cA    |Gcommit| --amend --reuse-message=HEAD
+                        ca    |Gcommit| --amend
                         D     |:Gdiff|
                         ds    |:Gsdiff|
                         dp    |:Git!| diff (mnemonic: p for patch)
diff --git a/plugin/fugitive.vim b/plugin/fugitive.vim
index dae8a14..ddf29bb 100644
--- a/plugin/fugitive.vim
+++ b/plugin/fugitive.vim
@@ -1802,6 +1802,8 @@ function! s:BufReadIndex()
     nnoremap <buffer> <silent> a :<C-U>let b:fugitive_display_format += 1<Bar>exe <SID>BufReadIndex()<CR>
     nnoremap <buffer> <silent> i :<C-U>let b:fugitive_display_format -= 1<Bar>exe <SID>BufReadIndex()<CR>
     nnoremap <buffer> <silent> C :<C-U>Gcommit<CR>
+    nnoremap <buffer> <silent> cA :<C-U>Gcommit --amend --reuse-message=HEAD<CR>
+    nnoremap <buffer> <silent> ca :<C-U>Gcommit --amend<CR>
     nnoremap <buffer> <silent> D :<C-U>execute <SID>StageDiff('Gvdiff')<CR>
     nnoremap <buffer> <silent> dd :<C-U>execute <SID>StageDiff('Gvdiff')<CR>
     nnoremap <buffer> <silent> dh :<C-U>execute <SID>StageDiff('Gsdiff')<CR>