diff --git a/modules/terraform/cmd.go b/modules/terraform/cmd.go
index c6c5d2380..ea4baf511 100644
--- a/modules/terraform/cmd.go
+++ b/modules/terraform/cmd.go
@@ -60,6 +60,8 @@ func GetCommonOptions(options *Options, args ...string) (*Options, []string) {
 		}
 		_, tgLogSet := options.EnvVars["TERRAGRUNT_LOG_FORMAT"]
 		if !tgLogSet {
+			// key-value format for terragrunt logs to avoid colors and have plain form
+			// https://terragrunt.gruntwork.io/docs/reference/cli-options/#terragrunt-log-format
 			options.EnvVars["TERRAGRUNT_LOG_FORMAT"] = "key-value"
 		}
 		_, tgLogFormat := options.EnvVars["TERRAGRUNT_LOG_CUSTOM_FORMAT"]
diff --git a/modules/terraform/output.go b/modules/terraform/output.go
index 93a2ed299..b4b67ec7b 100644
--- a/modules/terraform/output.go
+++ b/modules/terraform/output.go
@@ -16,8 +16,10 @@ import (
 const skipJsonLogLine = " msg="
 
 var (
+	// ansiLineRegex matches lines starting with ANSI escape codes for text formatting (e.g., colors, styles).
 	ansiLineRegex = regexp.MustCompile(`(?m)^\x1b\[[0-9;]*m.*`)
-	tgLogLevel    = regexp.MustCompile(`.*time=\S+ level=\S+ prefix=\S+ binary=\S+ msg=.*`)
+	// tgLogLevel matches log lines containing fields for time, level, prefix, binary, and message, each with non-whitespace values.
+	tgLogLevel = regexp.MustCompile(`.*time=\S+ level=\S+ prefix=\S+ binary=\S+ msg=.*`)
 )
 
 // Output calls terraform output for the given variable and return its string value representation.