diff --git a/README.md b/README.md
index 552784b..45ef61c 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ Updating
 
 Run `zprezto-update` to automatically check if there is an update to zprezto.
 If there are no file conflicts, zprezto and its submodules will be
-automatically updated. If there are conflicts you will instructed to go into
+automatically updated. If there are conflicts you will be instructed to go into
 the `$ZPREZTODIR` directory and resolve them yourself.
 
 To pull the latest changes and update submodules manually:
diff --git a/modules/completion/external b/modules/completion/external
index cf56525..ed4ff53 160000
--- a/modules/completion/external
+++ b/modules/completion/external
@@ -1 +1 @@
-Subproject commit cf565254e26bb7ce03f51889e9a29953b955b1fb
+Subproject commit ed4ff5384b03aa775a57d4c9588c88850026b0b3
diff --git a/modules/editor/init.zsh b/modules/editor/init.zsh
index 28a2fb2..5b411f5 100644
--- a/modules/editor/init.zsh
+++ b/modules/editor/init.zsh
@@ -318,6 +318,7 @@ bindkey -M vicmd "$key_info[Control]X$key_info[Control]E" edit-command-line
 
 # Undo/Redo
 bindkey -M vicmd "u" undo
+bindkey -M viins "$key_info[Control]_" undo
 bindkey -M vicmd "$key_info[Control]R" redo
 
 if (( $+widgets[history-incremental-pattern-search-backward] )); then
diff --git a/modules/helper/init.zsh b/modules/helper/init.zsh
index 6e83f89..0553556 100644
--- a/modules/helper/init.zsh
+++ b/modules/helper/init.zsh
@@ -49,3 +49,8 @@ function is-bsd {
 function is-cygwin {
   [[ "$OSTYPE" == cygwin* ]]
 }
+
+# is true on termux (Android)
+function is-termux {
+  [[ "$OSTYPE" == linux-android ]]
+}
diff --git a/modules/python/init.zsh b/modules/python/init.zsh
index 33248ba..b878f04 100644
--- a/modules/python/init.zsh
+++ b/modules/python/init.zsh
@@ -71,7 +71,7 @@ function _python-workon-cwd {
   if [[ "$ENV_NAME" != "" ]]; then
     # Activate the environment only if it is not already active
     if [[ "$VIRTUAL_ENV" != "$WORKON_HOME/$ENV_NAME" ]]; then
-      if [[ -e "$WORKON_HOME/$ENV_NAME/bin/activate" ]]; then
+      if [[ -n "$WORKON_HOME" && -e "$WORKON_HOME/$ENV_NAME/bin/activate" ]]; then
         workon "$ENV_NAME" && export CD_VIRTUAL_ENV="$ENV_NAME"
       elif [[ -e "$ENV_NAME/bin/activate" ]]; then
         source $ENV_NAME/bin/activate && export CD_VIRTUAL_ENV="$ENV_NAME"
diff --git a/modules/utility/init.zsh b/modules/utility/init.zsh
index caa0ec8..7bb7532 100644
--- a/modules/utility/init.zsh
+++ b/modules/utility/init.zsh
@@ -140,6 +140,10 @@ elif is-cygwin; then
   alias o='cygstart'
   alias pbcopy='tee > /dev/clipboard'
   alias pbpaste='cat /dev/clipboard'
+elif is-termux; then
+  alias o='termux-open'
+  alias pbcopy='termux-clipboard-set'
+  alias pbpaste='termux-clipboard-get'
 else
   alias o='xdg-open'