diff --git a/src/parser/commands_registration.jl b/src/parser/commands_registration.jl
index 3986bbe..1dfbd70 100644
--- a/src/parser/commands_registration.jl
+++ b/src/parser/commands_registration.jl
@@ -62,6 +62,8 @@ end
 
 command_to_canonical[raw"\frac"] = TeXExpr(:argument_gatherer, [:frac, 2])
 command_to_canonical[raw"\sqrt"] = TeXExpr(:argument_gatherer, [:sqrt, 1])
+command_to_canonical[raw"\begin"] = TeXExpr(:argument_gatherer, [:begin_env, 1])
+command_to_canonical[raw"\end"] = TeXExpr(:argument_gatherer, [:end_env, 1])
 
 ##
 ## Commands from the commands_data.jl file
@@ -118,6 +120,7 @@ for command in combining_accents
     command_to_canonical[command] = TeXExpr(:argument_gatherer, [:combining_accent, 2, symbol_expr])
 end
 
+
 for symbol in punctuation_symbols
     symbol = first(symbol)
     symbol_to_canonical[symbol] = TeXExpr(:punctuation, symbol)