diff --git a/server/handlers/ssh_config/analyzer/options.go b/server/handlers/ssh_config/analyzer/options.go
index 34dc670..275b444 100644
--- a/server/handlers/ssh_config/analyzer/options.go
+++ b/server/handlers/ssh_config/analyzer/options.go
@@ -2,6 +2,7 @@ package analyzer
 
 import (
 	"config-lsp/common"
+	docvalues "config-lsp/doc-values"
 	"config-lsp/handlers/ssh_config/ast"
 	"config-lsp/handlers/ssh_config/fields"
 	"config-lsp/utils"
@@ -40,7 +41,7 @@ func checkOption(
 	checkIsUsingDoubleQuotes(ctx, option.Key.Value, option.Key.LocationRange)
 	checkQuotesAreClosed(ctx, option.Key.Value, option.Key.LocationRange)
 
-	_, found := fields.Options[option.Key.Key]
+	docOption, found := fields.Options[option.Key.Key]
 
 	if !found {
 		// Diagnostics will be handled by `values.go`
@@ -61,6 +62,19 @@ func checkOption(
 	if option.OptionValue != nil {
 		checkIsUsingDoubleQuotes(ctx, option.OptionValue.Value, option.OptionValue.LocationRange)
 		checkQuotesAreClosed(ctx, option.OptionValue.Value, option.OptionValue.LocationRange)
+
+		invalidValues := docOption.DeprecatedCheckIsValid(option.OptionValue.Value.Value)
+
+		for _, invalidValue := range invalidValues {
+			err := docvalues.LSPErrorFromInvalidValue(option.Start.Line, *invalidValue)
+			err.ShiftCharacter(option.OptionValue.Start.Character)
+
+			ctx.diagnostics = append(ctx.diagnostics, protocol.Diagnostic{
+				Range:    err.Range.ToLSPRange(),
+				Message:  err.Err.Error(),
+				Severity: &common.SeverityError,
+			})
+		}
 	}
 
 	if option.Separator == nil || option.Separator.Value.Value == "" {